Electron scattering at steps: image-potential states on Cu(119)

The dynamics of image-potential states on Cu(119) have been studied with two-photon photoemission. Direction-dependent quasielastic scattering processes with large momentum transfer are attributed to the finite terrace-width distribution on the stepped surface. This effectively couples image-potenti...

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Bibliographic Details
Published in:Physical review letters 2002-03, Vol.88 (9), p.096802-096802, Article 096802
Main Authors: Roth, Manfred, Pickel, Martin, Jinxiong, Wang, Weinelt, Martin, Fauster, Thomas
Format: Article
Language:English
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Summary:The dynamics of image-potential states on Cu(119) have been studied with two-photon photoemission. Direction-dependent quasielastic scattering processes with large momentum transfer are attributed to the finite terrace-width distribution on the stepped surface. This effectively couples image-potential states via interband scattering and leads to an asymmetry of the decay rate. Electrons in the first image-potential state live apparently longer when running upstairs.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.88.096802